Transit Gateway
a network transit hub to interconnect VPCs and on-premises
Overview
A network transit hub that you can use to connect your VPCs to on-premises network.
simplifies networking by acting as a regional virtual router.
Your data is encrypted automatically, and NEVER travels over the public internet.
Best practices
Use seperate subnet for each transit gateway. For each subnet, use a small CIDR /28
Trivia
Transit gateway is a regional resource that resides outside the VPC.
Routing through a transit gateway operate at Layer 3.
Concepts
ASN (Autonomous System Number): is for the AWS side of a Border Gateway Protocol (BGP) session. You can use the default ASN, or you can specify a private ASN in the 64512-65534 or 4200000000-4294967294 ranges.
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